In Java, there are few ways to read a file.

Date: 2019-08-11 View: 1867

Java How to send Email

To send email in Java, we need JavaMail

Date: 2019-08-11 View: 1929

Spring Boot How to send email via SMTP

In this tutorial, we will show you how to send email via SMTP in Spring Boot.

Date: 2019-08-11 View: 1841

Spring Read file from resources folder

In Spring, we can use ClassPathResource or ResourceLoader to get files from classpath easily.

Date: 2019-08-11 View: 1991

A popular error message for new Java users.

Date: 2019-08-11 View: 1970

javac is not recognized as an internal or external command, operable program or batch file

A popular common error for new Java users.

Date: 2019-08-11 View: 2121

In Java, for primitive types, parameters are pass-by-value; For object types, object reference is pass-by-value, however, Java is allowed to modify object’s fields via object reference.

Date: 2019-08-11 View: 1802

A simple List.add() and hits the following java.lang.UnsupportedOperationException

Date: 2019-08-11 View: 1723

A Java 2d array example.

Date: 2019-08-11 View: 2099

How to get user input in Java

In Java, we can use java.util.Scanner to get user input from console.

Date: 2019-08-11 View: 2053

Start a Java class and hits this java.lang.UnsupportedClassVersionError, what is class file version 52 56?

Date: 2019-08-11 View: 2026

How to check which JDK version compiled the class?

In Java, we can use javap -verbose className to print out the class information.

Date: 2019-08-11 View: 1779

In the old days, we can use list.toArray(new String[0]) to convert a ArrayList<String> into a String[]

Date: 2019-08-11 View: 1912

Gson provide simple toJson() and fromJson() methods to convert Java objects to / from JSON.

Date: 2019-08-11 View: 2205

Few Jackson examples to convert a JSON array string to a List

Date: 2019-08-11 View: 2277